About your questions:
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You must not assume this fact, the elements are numbered when are generated, and when all meshers finish could be renumerated to avoid numeration jumps.
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Not exists in GiD the renumeration “node numbering to follow element numbers sequentially”, usally we renumber to avoid numeration jumps, and to have a low ‘bandwith’ (maximum difference of node’s number for the worst element), to aid a little FEM direct LU like solvers with band or skyline storage.
This is the help about the current algorithms:
The nodes renumeration algorithm can be set with the variable ‘RenumberMethod’ (see Preferences)
Accepted values are:
-2 : Avoid nodes and elements renumeration, entities numbers are set increasingly when they are generated.
-1 : Avoid nodes renumeration, nodes numbers are set increasingly when they are generated
0 : Geometrical algorimth, ordered by the distance to some coordinate. It is the default value
1 : Reverse Cuthill-McKee algorimth, similar to the previous one, but following element’s connectivities
2 : ordered following the XYZ axes, interesting for special cases with geometry aligned to the axes
Note: Negative numbers in this variable are understood as internal checks and tests, so they are not loaded from the model if it’s meshing preferences are set.
You can implement a Tcl procedure to renumber the mesh with your own algoritm,
this renumeration can be automatically invoked from the GiD event
proc AfterMeshGeneration { fail } {
}
AfterMeshGeneration: will be called after the mesh generation. It receives as its fail argument a true value if the mesh is not created.
Regards
Enrique
----- Original Message -----
From: Shriram
To: gidlist at gatxan.cimne.upc.edu
Sent: Thursday, February 11, 2010 12:19 AM
Subject: [GiDlist] Node Numbering
Hi,
I am referring to 2D and quad elements throughout the context.
\
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If there are multiple surfaces, is it true that the surface with entity number '1' will always have the first element when meshed?
2) After meshing multiple surfaces, I want the node numbering to follow element numbers sequentially. I try to do this by the command :
“Mescape Utilities Variables renumbermethod 1” at the command line and then Utilities - Renumber.
However, it doesn’t happen all the time. Can you tell me how to get the nodes to follow element numbers when there is more than 1 surface? Is there a way to know where GiD puts the first node or it’s random?
The following images show an example:
\
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Surfaces meshed with default meshing
2) After renumbering (Nodal connectivities do not follow from E1 onwards)
Thanks,
Shriram
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